WCF和多回調契約可能

Question

我在WCF.i新手正在尋找多種回調契約可以或不可以的出路像下面

[ServiceContract (
CallbackContract = typeof (CallbackContract_1), 
CallbackContract = typeof (CallbackContract_2), 
CallbackContract = typeof (CallbackContract_3)) 
] 
public interface SomeWcfContract {} 

我在谷歌搜索和發現的出路，這是像

interface ICallbackContract1 
{...} 

interface ICallbackContract2 : ICallbackContract1 
{...} 

[ServiceContract(CallbackContract = typeof(ICallbackContract1))] 
interface IMyBaseContract 
{...} 

[ServiceContract(CallbackContract = typeof(ICallbackContract2))] 
interface IMySubContract : IMyBaseContract 
{...} 

or 

interface ICallbackContract1 
{...} 
interface ICallbackContract2 
{...} 
interface ICallbackContract3 : ICallbackContract2,ICallbackContract1 
{...} 

[ServiceContract(CallbackContract = typeof(ICallbackContract1))] 
interface IMyBaseContract1 
{...} 
[ServiceContract(CallbackContract = typeof(ICallbackContract2))] 
interface IMyBaseContract2 
{...} 
[ServiceContract(CallbackContract = typeof(ICallbackContract3))] 
interface IMySubContract : IMyBaseContract1,IMyBaseContract2 
{...} 

我只需要知道是否有任何其他出路多回調合同。謝謝

Answer 1

對於單個服務合約（它是1：1關係，回調合約可以爲空），您不能有多個回調合約。正如你發現的那樣，這種替代方案（使用多個「前向」合同，每一個都有自己的回調合約）應該能夠工作，儘管我還沒有嘗試過（你可以編寫一個簡單的程序來測試它）。